I have some interlock woolies in variation of color (red,blue, green,orange) , but it looks like the dye hasn't set yet. I'm planning to set it with synthrapol because vinegar doesn seem to work. Can I wash them together in the washing machine?

Are you using scented wool washes? I would switch to unscented. If you really like scented woolies then buy the spray on kind for after washing. I have found that even if its dyed by a manufacturer or company scents will make things bleed.